MONAZITE IN THE PHYLLITE-LIKE SLATE OF THE SKELYUVATKA SUITE OF THE KRYVYI RIH SERIES

For the first time monazite grains were discovered in the phyllite-like quartz-sericite slate of the Skelyuvatka Suite of the Kryvyi Rih Series. The studied monazite grain consists of a relatively clean core and an outer zone with a significant amount of quartz and sericite inclusions. A relict crystal of detrital monazite was identified inside the core. The REE distribution in the volume (the core part of the grain is enriched in Nd, medium and heavy REE, the outer part is characterized by a much larger quantity of La and Ce, and, accordingly, much smaller quantity of Nd, Sm, Eu, Gd, Tb, Dy etc.) the presence of inclusions of minerals of the host rock in the structure of the monazite grain, the degree of metamorphism of the host rock, gave grounds for classifying the studied grain as nodular monazite (kularite), a hypogene mineral of the phyllite-like slate of the Skelyuvatka Suite of the Kryvyi Rih Series.